Combine flour and next 3 ingredients in a bowl. Add beef, tossing to coat. Heat oil in pan over high heat. Add beef; sauté 6 minutes or until beef is done. Add reserved onion mixture and broth. Bring to a boil, reduce heat, and simmer 2 minutes or until sauce is thick. Remove from heat; stir in sour cream. Sprinkle with parsley. Serve over noodles.

Chef's Notes

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